It is well known that the downsizing philosophy allows the improvement of the brake specific fuel consumption (BSFC) at part load operation for spark ignition (SI) engines. On the other hand, the BSFC is penalized at high load because of the knock occurrence and of further limitations on the turbine inlet temperature (TIT). Knock control forces the adoption of a late combustion phasing, while the TIT control requires the enrichment of the air-to-fuel ratio (A/F), both penalizing BSFC. In this work, two promising techniques are investigated by a 1D approach with the aim of improving the fuel economy of a turbocharged SI engine at full load. The first technique is the recirculation of low-pressure cooled exhaust gas (EGR), while the second is the injection of liquid water. The effects of the above techniques are studied in six operating points at full load and different speeds for various A/F levels and inert content. The presented results highlight that both the solutions involve significant BSFC improvements, especially in the operating conditions at medium engine speeds. The developed numerical procedure is able to take into account the complex interactions among different driving parameters affecting the engine behaviour.

Potentials of cooled EGR and water injection for knock resistance and fuel consumption improvements of gasoline engines / Bozza, Fabio; DE BELLIS, Vincenzo; Teodosio, Luigi. - In: APPLIED ENERGY. - ISSN 0306-2619. - 169:(2016), pp. 112-125. [10.1016/j.apenergy.2016.01.129]

Potentials of cooled EGR and water injection for knock resistance and fuel consumption improvements of gasoline engines

BOZZA, FABIO;DE BELLIS, VINCENZO;TEODOSIO, LUIGI
2016

Abstract

It is well known that the downsizing philosophy allows the improvement of the brake specific fuel consumption (BSFC) at part load operation for spark ignition (SI) engines. On the other hand, the BSFC is penalized at high load because of the knock occurrence and of further limitations on the turbine inlet temperature (TIT). Knock control forces the adoption of a late combustion phasing, while the TIT control requires the enrichment of the air-to-fuel ratio (A/F), both penalizing BSFC. In this work, two promising techniques are investigated by a 1D approach with the aim of improving the fuel economy of a turbocharged SI engine at full load. The first technique is the recirculation of low-pressure cooled exhaust gas (EGR), while the second is the injection of liquid water. The effects of the above techniques are studied in six operating points at full load and different speeds for various A/F levels and inert content. The presented results highlight that both the solutions involve significant BSFC improvements, especially in the operating conditions at medium engine speeds. The developed numerical procedure is able to take into account the complex interactions among different driving parameters affecting the engine behaviour.
2016
Potentials of cooled EGR and water injection for knock resistance and fuel consumption improvements of gasoline engines / Bozza, Fabio; DE BELLIS, Vincenzo; Teodosio, Luigi. - In: APPLIED ENERGY. - ISSN 0306-2619. - 169:(2016), pp. 112-125. [10.1016/j.apenergy.2016.01.129]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/631221
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